Superpower compared to a Dry Cell Battery

How does Superpower compare to a supply that some consider the best DC source?

Dynamic performance of a 1.8A current step was compared between a
Superpower and a 6V battery. The battery is a new carbon zinc dry cell type,
one of those big ones that looks like a square brick with 2 springs on top and goes in a
flashlight. We also tried four new AA size alkaline batteries in series
with virtually the same result.

The measurement was made by supplying Vin to a Superpower device under test (DUT)
from a power supply using a Superpower and from a battery. Vin from the power
supply was 6.25V and from the battery was 6.5V (it was previously unused). The DUT
was a SPJ78 at 5V out. If you didn't peek ahead, take a guess as to which has better
current delivery.

Dynamic performance

Superpower, 1.8A pulse

Superpower delivering 1.8A. The bottom trace shows Vout
measured across a ½Ω load resistor.
Top trace shows Vout to ground. The almost invisible shift at this scale
is almost entirely due to contact resistance in the test socket.

Battery, 1.8A pulse

Battery trying to deliver 1.8A. Bottom trace shows Vout
across a ½Ω resistor (1.8A/div). Top trace shows Vout to ground.
Notice that Vout is limited by the battery as its internal resistance changes
due to (most likely) internal heating. Superpower wins again!